Lock-nut.



.No. 897,168. PATBNTED AUG. 25, 1908.

H. L. SMITH.

LOCK NUT.

APPLICATION FILED NOV. 22, 1907.

a umlwem 4 %//M j? I j a i ammo z 4 j 14 Harglflmz'ih Witness HARRY L.SMITH, OF PITTSBURG, PENNSYLVANIA.

LOCK-NUT.

Specification of Letters Patent.

Patented Aug. 25, 1908.

Application filed November 22, 1907. Serial No. 403,334.

T 0 all whom it may concern:

Be it known that I, HARRY L. SMITH, a

citizen of the United States, residing at Pittsburg, in the county ofAllegheny and State of Pennsylvania, have invented new and usefulImprovements in Lock-Nuts, of which the following is a specification.

This invention relates to nut locks, and the object of the invention isto provide a device of this character which will effectively retain thenut upon a bolt after the elements have been assembled and which alsoprovides means whereby the nut may be readily detached from the bolt.

WVith these objects in view the invention resides in the novelconstruction of elements and their assemblage in operative combinationas will hereinafter be fully described and claimed.

In the drawing, Figure 1 is a cross sectional view of a railway rail andfish plates, and showing my device in operative position thereon. Fig. 2is a cross sectional view taken upon the line 2-2 of Fig. 1. Fig. 3 is aperspective view of a nut and thimble employed with my device. Fig. 3 isa rear elevation of the nut and thimble illustrated in Fig. 3. Fig. 4 isa perspective view of the locking nut. Figs. 5 and 6 are perspectiveviews of wrenches which may be employed in applying or detaching myimproved nut lock, and Fig. 7 is a detail perspective view of thethimble detached.

In the drawing the numeral 1 illustrates a railway rail of the ordinaryconstruction and provided with the usual fish plates 2. The rail isshown merely to illustrate the application of my device, as it will beunderstood that the improved nut lock may be used upon all places wheremotion and vibration tend to loosen the nuts and bolts, such as bridgeand marine construction, axles of vehicles, etc.

In carrying out my invention a bolt 3 of the ordinary construction,having the threaded portion 4 is employed, and mounted upon the threadsof the bolt is a thimble 5, immovably secured to a hollow nut 6 andhaving its projecting portion tapered toward its free end, and thistapering extension slit or sawed to provide a plurality of resilientfingers 7. The nut 6 is screw threaded upon its inner hollow face 8 at apitch corresponding to and in the same direction of the pitch of thethreaded portion 4 of the bolt 3, and

is adapted for the reception of the threaded portion 9 of the lockingnut 10. The locking nut 10is provided with an internal coneshaped recess11 terminating in a vertical wall 12 and a screw threaded opening isprovided for the nut from the wall 12 to its outer free extremity. Awrench hold 13 is provided upon the outer face of the nut 10 adapted forthe reception of the wrench 14 when the elements of the locking nut areto be assembled, while the wrench 15 is adapted for engagement with thenut 6 when being applied upon the screw-threaded portion 4 of the bolt3.

In assembling my locking device upon a bolt the hollow nut 6 carryingthe split thimble 7 is rotated upon the bolt, the threads of the splitthimble engaging the threads of the bolt. When these members aresufficiently tightened the locking nut or element is applied, thethreads within the interior of the element engaging the threads 4 of thebolt, while the threads 9 of the element engage with the threads uponthe inner hollow face of the nut 6, and the cone-shaped recessed portionof the locking element bears against the fingers 7 of the split thimble5, forcing the fingers tightly against the threads of the bolt 4 andsecurely retaining the device in an immovable position upon the bolt.

Should it be desired to remove the bolt and locking device, the wrench15 is applied upon the nut 6 to hold it in an immovable po sition, thewrench 14 applied upon the nut hold 13 of the locking element 10 and thelocking element unscrewed from its engagement with the nut 6, thefingers 7 of the thimble 5 are then allowed to spring away fromengagement with the threads of the bolt 4 at their ends and the wrench15 rotated to disengage the thimble 5 from the bolt 4, and the arts thusdisassembled.

While I have escribed the preferred inven tion of the device minordetails of construction may be resorted to without departing from orsacrificing the spirit of the invention.

Having thus fully described the invention what is claimed as new is:

In a nut lock, the combination of a bolt, a hollow nut and a taperingthimble provided with split fingers internally threaded and adapted forengagement with the threads of the bolt, and a locking nut having anouter threaded portion, the threads of said ortion being at a pitchcorresponding wlth the threads of the bolt, a cone-shaped recess and aninternal threaded portion, the internal threaded portion of the lockingnut adapted to engage the threads of the bolt, the outer threadedportion of the locking nut ada ted to engage the internal threads of theho 10w nut and the walls of the cone-shaped recess of the locking nutadapted to contact with the s lit fingers of the tapering thirnble whenthe ei ements are in locked position; :0 In testimony whereof I affix mysignature in presence of two witnesses.

HARRY L. SMITH. Witnesses:

JOHN. A. FISHER, G. C'. MCKNIGHT.

